Process for preparing a zeolite with structure type MTT using zeolitic material seeds

A process including stages of forming a crystallized zeolite with structure type MTT comprising at least one element X selected from silicon and germanium and at least on element T selected from iron, aluminum, gallium, boron, titanium, vanadium, zirconium, molybdenum, arsenic, antimony, chromium and manganese;

• and hydroisomerizing paraffins with catalysts containing said crystallized zeolite with structure type MTT, said process comprising:
• crystallizing a reaction mixture to form said zeolite with structure type MTT, said reaction mixture containing seeds of at least one zeolitic material comprising at least on element X′ selected from silicon and germanium and at least one element T′ selected from iron, aluminum, gallium, boron, titanium, vanadium, zirconium, molybdenum, arsenic, antimony, chromium, and manganese, with an X′/T′ ratio of less than 200, said seeds being different from the crystallized zeolite MTT being prepared, said reaction mixture further containing at least one organic template, said organic template being an alkylated α-ω diammonium polymethylene derivative with the formula:
• R1R2R3N+(CH2)nN+R4R5R6, and/or a degradation product of the amine corresponding to said derivative and/or a precursor corresponding to said derivative, n being in the range of 3 to 14 and R1 to R6, which may be identical or different, representing alkyl or hydroxyalkyl radicals containing 1 to 8 carbon atoms;
• up to five R1 to R6 radicals possibly being hydrogen;
• and
• hydroisomerizing paraffins containing 6 to 10 carbon atoms per molecule in the presence of a catalyst comprising resultant crystallized zeolite, said hydroisomerizing being carried out at a temperature in the range 150° C. to 350° C., at a partial pressure of hydrogen in the range 0.1 to 7 MPa, at a space velocity in the range 0.2 to 10 liters of liquid hydrocarbons per liter of catalyst per hour, with a hydrogen/feed mole ratio at the reactor inlet such that the